The Time line of the British Army 1900–1999 lists the conflicts and wars the British Army were involved in.

Boxer Rebellion ended 1901

Anglo-Aro War 1901–1902

Second Boer War ended 1902

World War I 1914–1918

Easter Rising 1916

Third Anglo Marri War 1917

Third Afghan War 1919

Irish War of Independence 1919–1921

World War II 1939–1945

Greek civil war 1946-47

Malayan Emergency 1948–1960

Korean War 1950–1953

Mau Mau Uprising 1952–1960

Cypriot Independence 1955–1959

Suez Crisis 1956–1957

Brunei Revolt 1962–1966

Indonesia–Malaysia confrontation 1962-1966

Dhofar Rebellion 1962–1975

Aden Emergency 1963–1967

The Troubles 1968–1998

Operation Banner 1969–2007

Falklands War 1982

Gulf War 1990–1991

Yugoslav wars 1991–2001

Bosnian War 1992–1995

Kosovo War 1998–1999

See also

Timeline of the British Army

Timeline of the British Army 1700–1799

Timeline of the British Army 1800–1899

Timeline of the British Army since 2000

20th-century conflicts

20th-century history of the British Army

British Army 1900-1999

Timeline of the British Army 1900–1999